Graphene heat-conducting fin

Abstract

The utility model discloses a graphene heat-conducting sheet, which comprises a heat-conducting substrate, the heat-conducting substrate is at least composed of a plurality of graphene film layers stacked along the width direction, a flexible connecting layer is arranged between any two adjacent graphene film layers, and the top surface of the heat-conducting substrate is covered with a protective film; a back adhesive layer is arranged on the bottom surface of the heat-conducting substrate, or the protective film is provided with an edge strip extending out of the heat-conducting substrate along the horizontal direction, and a bonding layer is arranged on the lower end surface of the edge strip on the same side as the bottom surface of the heat-conducting substrate. The utility model provides a graphene heat-conducting fin which can be attached between two devices needing heat conduction, the contact area between the devices is increased, the heat conductivity is further improved, meanwhile, the graphene heat-conducting fin has good abrasion resistance, and the requirement for repeated plugging and unplugging of the two devices can be met.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of heat-conducting gaskets, in particular to a graphene heat-conducting sheet. BACKGROUND

[0002] There are many plug-in installation scenarios in electronic products, such as optical modules, memory sticks, hard drives, etc. These devices have high heat generation and need to ensure heat dissipation during device operation. The more common heat dissipation measure in the prior art is to use the contact between the plug-in to achieve heat conduction and heat dissipation, that is, by contacting the plug-in position, the heat of these heat-generating devices is conducted to the heat sink, liquid cooling plate, etc. heat dissipation components to achieve the purpose of heat dissipation.

[0003] However, the heat-generating device and the heat dissipation component are mostly rigid components, and the contact between the two at the plug-in position is a rigid surface contact, which will inevitably result in a small contact area due to the unevenness of the rigid device surface, affecting heat dissipation.

[0004] In the prior art, it has also been considered to attach an elastic heat-conducting interface material at the plug-in position of the heat-generating device and the heat dissipation component to increase the surface contact area and improve the heat dissipation effect, for example, using thermal silicone grease, heat-conducting gel, heat-conducting silicone pad, etc. as the heat-conducting interface material. This scheme can improve the heat dissipation effect, but the existing elastic heat-conducting interface material can easily be damaged if rubbed repeatedly, obviously, such existing heat-conducting gaskets cannot meet the heat dissipation needs of the plug-in application scenario in actual application. SUMMARY

[0005] The utility model aims to at least solve one of the technical problems in the related art to a certain extent: to provide a graphene heat-conducting sheet that can be attached between two devices that need heat conduction, increase the contact area between the devices, and thus improve the heat conductivity, while having good wear resistance, and can meet the needs of repeated plugging and unplugging of the two devices.

[0006] To this end, one purpose of the utility model is to provide a graphene heat-conducting sheet, which comprises a heat-conducting base sheet, the heat-conducting base sheet is composed of at least a plurality of graphene film layers stacked along the width direction, and a flexible connecting layer is provided between any two adjacent graphene film layers, and a protective film is provided on the top surface of the heat-conducting base sheet.

[0007] A back adhesive layer is provided on the bottom surface of the heat-conducting base sheet.

[0008] Alternatively,

[0009] The protective film has a horizontal edge extending to the outside of the heat-conducting base sheet, and an adhesive layer is provided on the lower end surface of the same side of the heat-conducting base sheet.

[0010] In the case of having the back adhesive layer, on one hand, the back adhesive layer can facilitate the graphene heat-conducting sheet to be pasted on the rigid surface which needs to dissipate heat, on the other hand, the back adhesive layer can cover the bottom surface of the heat-conducting sheet, reducing the escape of graphene powder or particles in the heat-conducting sheet. In addition, the edge strip formed by the extension of the protective film in the horizontal direction and the adhesive layer arranged on the lower end surface of the edge strip can also play a role in pasting and fixing, and since the bottom surface of the heat-conducting sheet can be directly in contact with the rigid surface which needs to dissipate heat, the heat transfer resistance of the back adhesive layer is reduced, so the heat-conducting efficiency is better.

[0011] Preferably, a release film is arranged on the back adhesive layer, and the release film is attached to the back adhesive layer in a tearable manner.

[0012] Preferably, the protective film covers the outer surface of the heat-conducting sheet, and the back adhesive layer is arranged on the protective film corresponding to the bottom surface of the heat-conducting sheet. The outer surface of the entire heat-conducting sheet is covered by the protective film, which not only makes the overall bending strength of the heat-conducting sheet better, but also reduces the risk of short circuit caused by the falling out of graphene powder particles and graphene fragments generated by fragmentation in the heat-conducting sheet.

[0013] Preferably, the heat-conducting sheet is provided with an edge sealing layer attached to the outer side wall of the heat-conducting sheet 1 on both sides in the width direction, and the protective film extends to the outside of the heat-conducting sheet in the length direction to form the edge strip. The edge strip formed by the extension of the protective film in the length direction can be pasted and fixed with the corresponding rigid surface, and the outermost layer on both sides of the heat-conducting sheet in the width direction is the connecting layer, so the connecting layer and the edge strip can restrict the graphene film layer in the heat-conducting sheet, reducing the escape of graphene powder particles, and since the bottom surface of the heat-conducting sheet is directly in contact with the rigid surface, the heat-conducting efficiency is better. In addition, the protective film does not extend in the width direction, so the overall size in the width direction is more compact.

[0014] Preferably, the protective film extends to the outside of the heat-conducting sheet in the length direction and the width direction to form the edge strip, and the edge strip is in the annular structure surrounding the heat-conducting sheet. The protective film extends to the outside of the heat-conducting sheet in the length direction and the width direction to form the edge strip surrounding the entire heat-conducting sheet. On one hand, the edge strip can be pasted and fixed with the corresponding rigid surface, playing a role in fixing, on the other hand, the edge strip can surround the side surface of the entire heat-conducting sheet, which can restrict the graphene film layer in the heat-conducting sheet, reducing the escape of graphene powder particles, and since the bottom surface of the heat-conducting sheet is directly in contact with the rigid surface, the heat-conducting efficiency is better.

[0015] Preferably, the thickness of the protective film is 5 μm to 20 μm. The protective film can have better wear resistance after thickening, improving the service life, but the heat-conducting efficiency will be reduced.

[0016] Preferably, the thickness of the protective film is 10 μm.

[0017] Preferably, the protective film comprises any one of a PI film or a PET film or a PE film.

[0018] Preferably, the protective film is an electrically conductive protective film made of an electrically conductive material, and the adhesive layer is an electrically conductive adhesive layer. After the protective film is made of an electrically conductive material, it not only has the advantages of good heat conduction and wear resistance, but also can realize electrical conduction, so that the graphene heat-conductive gasket can be applied to a slide-in application scenario that requires electrical conduction.

[0019] Preferably, the protective film is an electrically conductive protective film made of an electrically conductive material. After the protective film is made of an electrically conductive material, it not only has the advantages of good heat conduction and wear resistance, but also can realize electrical conduction, so that the graphene heat-conductive gasket can be applied to a slide-in application scenario that requires electrical conduction.

[0020] The above technical solution has the following advantages or beneficial effects: first, the graphene film layer and the connecting layer are alternately stacked to form a heat-conductive base sheet, which has better heat-conduction performance than conventional flexible heat-conductive interface materials; at the same time, a protective film is arranged on the top surface of the heat-conductive base sheet, which can effectively reduce the escape of graphene powder particles and reduce the probability of short-circuit failure caused by graphene powder; second, the protective film is extended along the length direction or simultaneously along the length and width directions to form a border, the adhesive layer on the border can not only play a fixing role, but also can surround the side edges of the heat-conductive base sheet to play an edge sealing role, further reducing the probability of escape of graphene powder particles; third, the protective film adopts a structure that covers the entire heat-conductive base sheet, which can better avoid the escape of graphene powder particles from the heat-conductive base sheet; finally, the protective film can be made of an insulating material or an electrically conductive material according to the needs of the use scenario, so that the graphene heat-conductive sheet can have both heat-conduction and electrical conduction functions.

[0021] The additional aspects and advantages of the present application will be partially given in the following description, and some will become apparent from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structure schematic view of the graphene heat-conductive sheet of the present application adopting the first structure.

[0023] Figure 2 is Figure 1 is a local enlarged schematic view of the "A" area in the middle.

[0024] Figure 3 is Figure 1 is a use state schematic view of the graphene heat-conductive sheet in the middle.

[0025] Figure 4It is the structure diagram of the graphene heat-conducting sheet adopting the second structure.

[0026] Figure 5 For Figure 4 The local enlarged schematic view of the "B" area in the middle.

[0027] Figure 6 For Figure 4 The use state schematic view of the graphene heat-conducting sheet in the middle.

[0028] Figure 7 The three-dimensional structure schematic view of the heat-conducting base sheet in the graphene heat-conducting sheet.

[0029] Figure 8 For Figure 7 The front view schematic view of the heat-conducting base sheet in the middle.

[0030] 1, heat-conducting base sheet; 1.1, graphene film layer; 1.2, connecting layer; 1.3, top surface; 1.4, bottom surface; 1.5, edge sealing layer; 2, protective film; 3, release film; 4, back adhesive layer; 5, edge strip; 6, adhesive layer; 7, heating device; 8, heat sink. DETAILED DESCRIPTION

[0031] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0032] The graphene heat-conducting sheet according to the embodiments of the present application is described in detail below with reference to the drawings.

[0033] The width direction in the following is the left-right direction shown in the drawings, the length direction is the direction perpendicular to the paper surface shown in the drawings, the horizontal direction is the plane direction constituted by the width direction and the length direction, the height direction and the thickness direction are the up-down directions shown in the drawings. Figure 8 Figure 8 Figure 8

[0034] Embodiment 1

[0035] The present application provides a graphene heat-conducting sheet, such as Figures 4-8 ​​​As shown, it comprises a sheet-shaped heat-conducting substrate 1, which is composed of at least a plurality of graphene film layers 1.1 stacked along the width direction, and a flexible connecting layer 1.2 is arranged between any two adjacent graphene film layers 1.1, and the top surface 1.3 of the heat-conducting substrate 1 is covered with a protective film 2, and the bottom surface of the heat-conducting substrate 1 is provided with a back adhesive layer 4. The back adhesive layer 4 in this embodiment has adhesion, and can be directly pasted on the corresponding heat-generating device or heat sink through the back adhesive layer 4, saving the action of additional coating of glue.

[0036] All graphene film layers 1.1 and connecting layers 1.2 in the heat-conducting substrate 1 of this embodiment are alternately stacked along the width direction, so that the graphene film layers 1.1 themselves are longitudinally arranged, that is, the heat transfer between the top surface 1.3 and the bottom surface 1.4 of the heat-conducting substrate 1 in the thickness direction is realized through the graphene film layers 1.1.

[0037] The connecting layer 1.2 in this embodiment is preferably a glue layer that can bond two graphene film layers 1.1 together in the prior art.

[0038] Based on the above preferred embodiment, the bottom surface 1.4 of the heat-conducting substrate 1 is provided with a release film 3, which is attached to the back adhesive layer 4 of the bottom surface 1.4 of the heat-conducting substrate 1 in a tearable manner. The release film 3 in this embodiment can be directly attached to the heat-generating device or the corresponding heat sink that needs to be cooled after being torn off.

[0039] Preferably, the thickness of the protective film 2 in the above embodiment is 5 μm to 20 μm. Specifically, the thickness of the protective film 2 is 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm.

[0040] Preferably, the protective film 2 is a thin film made of wear-resistant material and has a smooth surface. Specifically, the protective film 2 includes but is not limited to any one of PI film (polyimide film), PET film (polyethylene terephthalate film) or PE film (polyethylene film).

[0041] In the above embodiment, due to the presence of the protective film 2, not only can the graphene film layer 1.1 in the heat-conducting base sheet 1 be wrapped in the protective film 2, reducing the problem of graphene film layer 1.1 powder falling, but also the protective film 2 provides better wear resistance, so that the graphene heat-conducting sheet of the embodiment can be well applied to the sliding insertion use scene of electronic devices. For some use scenes that not only require heat conduction and heat dissipation but also require the heating device 7 and the heat sink 8 to be conductive, the preferred improvement of the embodiment is that the protective film 2 is made of a conductive material, and the adhesive layer 4 is a conductive adhesive layer. The conductive material used in the protective film 2 includes but is not limited to copper foil, aluminum foil, conductive cloth, etc., so that the protective film 2 has conductivity in addition to wear resistance and heat conduction.

[0042] Embodiment 2

[0043] Based on the above preferred embodiment 1, the protective film 2 extends from the top surface 1.3 of the heat-conducting base sheet 1 to the bottom surface 4 of the heat-conducting base sheet 1 along the outer contour of the heat-conducting base sheet 1, so that the protective film 2 wraps the entire outer surface of the heat-conducting base sheet 1, and the bottom surface 1.4 of the heat-conducting base sheet 1 is provided with an adhesive layer 4, and the release film 3 is attached to the adhesive layer 4.

[0044] Embodiment 3

[0045] The utility model provides a kind of graphene heat-conducting sheet, as shown in Figures 1-3 And Figure 7 And Figure 8 It includes sheet structure heat-conducting base sheet 1, the heat-conducting base sheet 1 is at least composed of multiple graphene film layers 1.1 stacked in width direction, and flexible connecting layer 1.2 is provided between any two adjacent graphene film layers 1.1, the top surface 1.3 of the heat-conducting base sheet 1 is covered with protective film 2, the protective film 2 has edge strip 5 extending to the outside of heat-conducting base sheet 1 in horizontal direction, and adhesive layer 6 is provided on the lower end face of the same side of the bottom surface 1.4 of heat-conducting base sheet 1 with edge strip 5.

[0046] All graphene film layers 1.1 and connecting layers 1.2 in the heat-conducting base sheet 1 of the embodiment are alternately stacked in width direction, so that the graphene film layer 1.1 is longitudinally arranged, that is, the graphene film layer 1.1 realizes heat transfer between the top surface 1.3 and the bottom surface 1.4 in the thickness direction of the heat-conducting base sheet 1.

[0047] The connecting layer 1.2 in the embodiment is preferably a glue layer that can bond two graphene film layers 1.1 together in the prior art.

[0048] Preferably, the bottom surface 1.4 of the heat-conducting substrate 1 is provided with a release film 3, which is attached to the bottom surface 1.4 of the heat-conducting substrate 1 in a tearable manner. As shown in the figure, the release film 3 extends to the position where the adhesive layer 6 is located on the edge strip 5.

[0049] Preferably, the thickness of the protective film 2 in the above-mentioned embodiments is 5 μm to 20 μm. Specifically, the thickness of the protective film 2 is 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, or 15 μm.

[0050] Preferably, the protective film 2 is a thin film made of wear-resistant material and has a smooth surface. Specifically, the protective film 2 includes, but is not limited to, any one of a PI film (polyimide film), a PET film (polyethylene terephthalate film), or a PE film (polyethylene film).

[0051] In the above-mentioned embodiments, due to the presence of the protective film 2, not only can the graphene film layer 1.1 in the heat-conducting substrate 1 be wrapped in the protective film 2, reducing the problem of graphene film layer 1.1 powder falling, but the protective film 2 also provides better wear resistance, so that the graphene heat-conducting sheet of this embodiment can be well applied to the sliding insertion use scenario of electronic devices. For some use scenarios that not only require heat conduction and heat dissipation but also require the heating device 7 and the heat sink 8 to be conductive, the preferred improvement of this embodiment is that the protective film 2 is a conductive protective film 2 made of conductive material. The conductive material includes, but is not limited to, copper foil, aluminum foil, conductive cloth, etc., so that the protective film 2 has conductivity in addition to wear resistance and heat conduction.

[0052] Embodiment 4

[0053] Based on the above-mentioned preferred embodiment 3, the heat-conducting substrate 1 is provided with an edge sealing layer 1.5 attached to the outer side wall of the heat-conducting substrate 1 on both sides in the width direction, and the protective film 2 extends to the outside of the heat-conducting substrate 1 in the length direction to form the edge strip 5. In this embodiment, since the first layer and the last layer of the heat-conducting substrate 1 are both edge sealing layers 1.5, the powdery particles falling from the graphene film layer 1.1 and the small particles generated by partial fragmentation can be restricted in the heat-conducting substrate 1 in the width direction by the edge sealing layer 1.5, and the protective film 2 only needs to extend to the outside in the length direction to form the edge strip 5. The lower end surface of the edge strip 5 is provided with an adhesive layer 6 with adhesion, so that the edge strip 5 and the adhesive layer 6 not only play a fixing role in attaching the graphene heat-conducting sheet to the heating device 7 and the heat sink 8, but also can restrict the powdery particles falling from the graphene film layer 1.1 and the small particles generated by partial fragmentation inside the heat-conducting substrate 1, avoiding the entry of graphene powder or impurity particles into electronic devices to cause short circuit failure.

[0054] Embodiment 5

[0055] Based on the above preferred embodiment 4, the protective film 2 extends to the outside of the heat-conducting substrate 1 in the length direction and the width direction to form the edge strip 5, and the edge strip 5 is an annular structure surrounding the heat-conducting substrate 1.

[0056] The release film 3 in the above embodiment plays a protective role, also known as a release film, an isolation film, a separation film, a glue blocking film, a release film, a silicone oil film, a silicone oil paper, an anti-adhesion film, and a release paper. After the release film 3 contacts the adhesive layer 6 or the back adhesive layer 4, the release film 3 and the corresponding adhesive layer 6 or back adhesive layer 4 do not have adhesion or have slight adhesion, so that the release film 3 can be easily torn.

[0057] Working principle: the release film 3 in the graphene heat-conducting sheet of the embodiment is torn off and removed, then the bottom surface 1.4 of the heat-conducting substrate 1 is aligned with the surface of the plug-in part of the heat-generating device 7 or the surface of the plug-in part of the heat sink 8, the back adhesive layer 4 on the bottom surface 1.4 of the heat-conducting substrate 1 is attached to the corresponding surface, or the adhesive layer 6 on the edge strip 5 around the bottom surface 1.4 of the heat-conducting substrate 1 is attached to the corresponding surface, the edges are flatly attached, and the installation of the graphene heat-conducting sheet is completed. Finally, the plug-in parts of the heat-generating device 7 and the heat sink 8 are inserted into each other, at this time, the two graphene heat-conducting sheets are well attached to the rigid surfaces of the heat-generating device 7 and the heat sink 8, and play a heat-conducting role. At the same time, due to the wear resistance of the protective film 2, the graphene heat-conducting sheet can meet the requirements of repeated plugging and unplugging.

[0058] It should be understood that, due to the diversification of the heat-generating device 7 and the heat sink 8 in the prior art, the sizes of the plug-in parts are different. When the size area of the rigid contact surface of the plug-in part is large, a plurality of graphene heat-conducting sheets in the above embodiment can be attached to the rigid contact surface, and the graphene heat-conducting sheets are arranged in an array.

[0059] It should be understood that, in the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0060] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and do not connote or imply any relative importance or any meaning pertaining to the quantity of the features being described. Thus, a feature defined with "first", "second", etc. can include one or more of the features implicitly or explicitly. In the description of the present application, the meaning of "a plurality of" is two or more, unless specifically defined otherwise.

[0061] In the present application, unless specifically defined and limited otherwise, the terms "mounting", "connecting", "connection", "fixing" and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0062] In the present application, unless specifically defined and limited otherwise, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0063] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or features of different embodiments or examples described in the present application without contradiction.

[0064] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. Those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

[0065] As will be obvious to those skilled in the art upon reading the above description, various changes and modifications can be made. Accordingly, it is intended that all changes and modifications that come within the true intent and scope of the present invention be embraced by the appended claims. Any and all equivalents are intended to be encompassed by the present invention.

Claims

1. A graphene thermal conductive sheet, characterized in that: The thermally conductive substrate (1) is composed of at least a plurality of graphene film layers (1.1) stacked along the width direction, and a flexible connecting layer (1.2) is provided between any two adjacent graphene film layers (1.1). The top surface (1.3) of the thermally conductive substrate (1) is covered with a protective film (2). The bottom surface of the thermally conductive substrate (1) is provided with an adhesive layer (4). or, The protective film (2) has a strip (5) extending horizontally to the outside of the thermally conductive substrate (1), and an adhesive layer (6) is provided on the lower end surface of the strip (5) on the same side as the bottom surface (1.4) of the thermally conductive substrate (1).

2. The graphene thermal conductive sheet according to claim 1, characterized in that: The adhesive backing layer (4) is provided with a release film (3), which is attached to the adhesive backing layer (4) in a way that can be torn.

3. The graphene thermal conductive sheet according to claim 2, characterized in that: The protective film (2) covers the outer surface of the thermally conductive substrate (1), and the adhesive layer (4) is located on the protective film (2) corresponding to the bottom surface (1.4) of the thermally conductive substrate (1).

4. The graphene thermal conductive sheet according to claim 1, characterized in that: The thermally conductive substrate (1) has a sealing layer (1.5) attached to the outer wall of the thermally conductive substrate (1) on both sides along the width direction, and the protective film (2) extends along the length direction to the outside of the thermally conductive substrate (1) to form the edge strip (5).

5. The graphene thermal conductive sheet according to claim 1, characterized in that: The protective film (2) extends along the length and width directions to form a strip (5) outside the heat-conducting substrate (1), and the strip (5) is an annular structure surrounding the heat-conducting substrate (1).

6. The graphene thermal conductive sheet according to any one of claims 1-5, characterized in that: The thickness of the protective film (2) is 5μm~20μm.

7. The graphene thermal conductive sheet according to claim 6, characterized in that: The thickness of the protective film (2) is 10 μm.

8. The graphene thermal conductive sheet according to any one of claims 1-5, characterized in that: The protective film (2) includes any one of PI film, PET film or PE film.

9. The graphene thermal conductive sheet according to claim 2, characterized in that: The protective film (2) is a conductive protective film (2) made of conductive material, and the backing layer (4) is a conductive adhesive layer.

10. The graphene thermal conductive sheet according to claim 1, 4, or 5, characterized in that: The protective film (2) is a conductive protective film (2) made of conductive material.

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